Nearly all capsizes can be assigned one of three causes.
Why do catamarans capsize. In serious storms one does need to be more skilled to handle a catamaran however the designs of modern catamarans have evolved to be. The keel helps stop boats rolling moving from side to side or capsizing because it means more force is required to push the boat sideways through the water or rotate it. If you value the members safety onboard your boat a cat wont let you down.
In other words instead of taking 10-12 degrees as the maximum likely heel an angle at when most boats are at their most stable 30 degrees would be a more realistic figure. Personal watercraft catamarans are a different story though. Do catamarans flip easily.
Phil Berman talks about capsizing catamarans and answers the question Can a Catamaran Capsize. Why Do Catamarans Capsize. Because of this they are regarded as one of the safest boats.
You could stay with the vessel for shelter and protection until you are rescued. Any boat can capsize if the wind is strong and the sea is rough. The larger vessels that is anyway.
A large modern catamaran has plenty of buoyancy and exceptional roll inertia. A catamarans twin hulls usually offer more stability but if you have so much sail exposed to the wind that the force of the wind is greater than the weight of the boat the boat will literally trip sideways over the. Nearly all capsizes can be assigned one of three causes.
But it does happen from time to time. By their nature larger catamarans are exceptionally safe offshore. 84 of the catamaran casualties were the result of wind induced capsize or pitchpoling.